Can I Use a WiFi to Ethernet Adapter for My Device?

Yes, wireless bridges definitely exist! Some brands like Buffalo used to make them, and a lot of access points can also be configured to act as a bridge. If you have an old router, you might be able to flash it with OpenWRT or another variant to set it up as a bridge, which could be useful for your situation.

Modern travel routers like the GL.iNet ones can serve as wireless bridges too. Just a heads-up: this can add some latency, similar to a WiFi extender, so keep that in mind when choosing your options.

I think a Raspberry Pi could do the trick for you! Just plug in a Wi-Fi dongle, connect it to the WiFi, and configure a bridge to the Ethernet connection. Even an older Pi model should handle this just fine.

A WiFi repeater can also work for this purpose. I’ve used a TP-Link one before, and it worked decently well for connecting to Ethernet.

You might be looking for a wireless access point that has an Ethernet port. If your Android box only has an RJ45 connection and no built-in WiFi, consider using a USB to RJ45 adapter, although I'm not sure if it would work with your box.